New Analysis of the CRDS Spectrum of the Six ¹⁶O/¹⁸O Isotopologues of Ozone up to 7920 cm⁻¹

We have extended the analysis of the near infrared absorption spectrum of ozone up to 7920 cm⁻¹ i.e. only 7 % below the dissociation energy, D₀. The spectra of ¹⁶O₃ and ¹⁸O₃ and of two ¹⁸O enriched samples were recorded at LIPhy-Grenoble by high-sensitivity Cavity Ring Down Spectroscopy between 5850 and 7920 cm⁻¹. In this presentation, we will update the recent review of Refs ^1,2 by new analysis for the different isotopologues, in particular the three most excited bands of ¹⁶O₃ reported so far. These results are of particular interest to test and validate the potential energy surface in its ground electronic state with potential impact on non-LTE studies.

Overall, a total of 71 bands were rovibrationally assigned and modelled:

29 bands for 666 (9024 assigned transitions)

7 bands for 668 (3117)

4 bands for 686 (1308)

3 bands for 886 (1849)

6 bands for 868 (1914)

22 bands for 888 (6332)

Total : 23544, leading to the knowledge of 13412 energy levels.

The effective Hamiltonian modelling also includes 69 dark bands in interaction with the observed bright bands. We will illustrate the achieved agreements between observed and calculated spectra. Comparisons between fitted and predicted band centres and rotational constants will be discussed.